[Metadata] Visibility shorthand

There is a lot of confusion that there is a visiblity("read") but no visibility("write"). It would be nice if "write" could be defined as a sort of "macro" that is equivalent to ["create", "update"] somehow. Failing that, we might need a linter to say "write" is probably not what you meant.

We might also want a visibility that applies to all parameters, like "request" that is equivalent to ["create", "query", "update", "delete"].